Federal safety regulators and Ford Motor Company are telling owners of nearly 149,000 recent Mustangs that engine-compartment ground connections can fracture in normal driving. When that happens, the car may lose motive power without warning, and the same fault can knock out headlights, windshield washers, air conditioning, or the cooling fan at the same time. Letters started reaching mailboxes in early September 2026, but the replacement parts are not broadly available yet, which leaves many S650 drivers carrying an open recall into daily commutes, night runs, and track weekends.
What NHTSA says failed on the S650
The campaign is NHTSA recall 26V547 (Ford recall 26C40). In the manufacturer report posted to the agency, Ford describes fractured ground eyelets on the engine-compartment wiring harness. Depending on which ground breaks first, drivers can see a check-engine light or hear a warning chime, then experience a sudden loss of drive power. Regulators also note that simultaneous loss of headlight or washer function can reduce visibility and that the condition relates to Federal Motor Vehicle Safety Standard (FMVSS) 104 (windshield wiping and washing) and FMVSS 108 (lamps and reflective devices). Ford told NHTSA it is aware of eight warranty claims tied to the defect and, as of mid-August 2026, no crashes or injuries linked to the issue. You can read the full notice and search by VIN at NHTSA.gov/recalls.
Which Mustangs are in the population
The recall covers certain 2024 through 2026 Ford Mustang cars built from September 7, 2022 through June 9, 2026. NHTSA lists 148,663 potentially affected vehicles. Both EcoBoost and GT variants use the same engine bay layout, so trim level alone does not remove a car from the campaign. VINs became searchable on the federal site on August 28, 2026. If you bought used, the prior owner’s mail may not follow the car, so a VIN lookup is the reliable step.
Signals you might notice before power drops
Ford’s defect description is not a silent failure. Owners have reported illuminated check-engine warnings, other dash messages, or an audible chime shortly before power cuts out. Because the harness serves multiple circuits, you might lose one headlamp, both washers, A/C, or the engine fan while the car still moves, or the stall may arrive with little margin to merge off a busy freeway. Treat any combination of those warnings as a cue to exit traffic, not as a nuisance light to reset later.
What to do when the recall is open but the fix is not ready
Dealers will replace the ground terminals at no charge once Ford releases parts and repair instructions. Interim owner letters went out around August 31 through September 5, 2026. Ford’s interim messaging has pointed to a remedy window around December 21, 2026, while NHTSA’s public record still lists March 2027 for remedy availability; until your dealer confirms stock, assume you are driving with the original terminals. Practical steps while you wait:
- Run your VIN on NHTSA and save the recall ID 26V547 in your records.
- Call Ford at 1-866-436-7332 with campaign 26C40 if your app or owner portal does not yet show the open campaign.
- Avoid treating the Mustang as the only car for long interstate trips if you already saw ground-related warnings.
- Carry a charged phone and know your nearest safe pull-off on regular routes; a sudden stall on a dark rural road is harder to manage without lights or washers.
- Do not disable warnings or clear codes without a diagnosis; the chime may be your only notice before a fracture completes.
If you are comparing two used Mustangs this month, running each VIN through CarDiary’s VIN check alongside the federal lookup helps you spot open campaigns before you sign paperwork.
How this differs from other recent Ford safety work
Separate campaigns have touched F-150 fuel tanks, rearview cameras on other nameplates, and unrelated electrical items. Recall 26V547 is specific to the current-generation Mustang platform and its engine-bay harness grounds, not to Mach-E or older S197/S550 cars. Fixing it requires dealer access to the harness terminals, not a software flash alone.
When the permanent repair lands
Ford will mail a second notice when parts and labor instructions are released nationwide. Schedule the harness terminal replacement promptly; the work should be free under federal recall rules regardless of mileage or ownership history. Keep your service invoice even though the repair is no-cost, because a documented fix can matter for resale and for any future warranty questions about related electrical gremlins.
